Ppt ระบบประสาท (nervous system) ชีววิทยา ม.5

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Ppt ระบบประสาท (nervous system) ชีววิทยา ม.5

  1. 1. - (neuron or nerve cell) (transducer) NERVOUS SYSTE
  2. 2. (Sy - 4 dendrite, cel terminal
  3. 3. Dendrite -dendrite cell body ( - cell body - polyribosome (or Nissl body) dendrite - axon
  4. 4. Cell body -Cell body soma dendrite axon maintenance site) - nucleus&organelle -ganglion (ganglia): nerve cell body PNS dorsal root ganglion (or sensory ganglion) -Nucleus (nuclei): nerve cell body (CNS)
  5. 5. -axon action potential cell body neuron cell body axon ending axon ending cell body -axon cell body axon hillox -axon hillox: dendrite Axon
  6. 6. -synaptic terminal (axon ending): axon neurotransmitter -synapse: synaptic terminal (neuron/effector) - presynaptic cell - postsynaptic cell ( receptor neurotransmitter presynaptic cell) Synaptic terminal
  7. 7. axon Axon Dendrite 1. 1. 2.smooth surface 2.rough surface (dendritic spine) 3. 1 axon/cell 3. 1 dendrite/cell 4. ribosome 4. ribosome 5. myelin 5. myelin 6. cell 6. cell body
  8. 8. -Glia: 10-50 -Astrocyte:glia cell CNS tight junction capillary Blood-brain barrier -Oligodendrocyte( CNS) Schwann cell ( PNS): glial cell myelin sheath Supporting cell or glial cells or
  9. 9. Blood-brain barrier
  10. 10. Neuron 3 1. Receptor (sensory) neuron ( receptor neuron) olfactory nerve cells receptor cell ( photoreceptor cell) sensory neuron) electrical signal interneuron motor neuron
  11. 11. 1. (sensory input) sensory receptor 2. (integration center): CNS 3. (motor output) effector cells PNS
  12. 12. Reflex arc motor neuron interneu integration ce or interneuron sensory receptor sensory neuron effector
  13. 13. Membrane potential -membrane potential: - (Na+ K+ Cl- = -50 - 100 mV - microelectrode voltmeter oscilloscope micromanipulator -membrane potential resting potential
  14. 14. -Chemically-gated ion channels: - neurotransmitter gated ion channel ion -Voltage-gated ion channels: - membrane potential
  15. 15. Hyperpolarization depolari Hyperpolarization: K+ channel, K+ (-70mV -90mV) Depolarization: Na+ channel, Na+ Graded potential hyper
  16. 16. Action potential -action potential: membrane potential depolarization threshold potential - axon all-or-none 5 1.Resting state 2.Threshold 3.Depolarization 4.Repolarization 5.Undershoot
  17. 17. 1: Resting State - voltage-gated Na+ K+ channel membrane’s resting potential
  18. 18. 2: Threshold - Na+ channel Na+ threshold potential Na+ gate action potential
  19. 19. 3: Depolarization -activation gate Na+ channel K+ channel Na+
  20. 20. 4: Repolarization - inactivation gate Na+ channel K+ channel Na+
  21. 21. 5: Undershoot -gate Na+ K+ channel (relatively slow gate) resting membrane potential repolarization undershoot
  22. 22. Propagation of action potent 1. action potential 1) N+ Na+ 2) depolarization action potential 2. 2 action potential 1 repolarization (refractory period) action potential 3. action potential 3
  23. 23. Saltatory conduction - myelinated axon action potential node of Ranvier node Na+ K+ - node of Ranvier saltatory conduction - action potential axon axon - myelinated axon action potential
  24. 24. Electrical synapse - presynatic membrane postsynaptic membrane gap junction ion current action potential Presynaptic membranePostsynaptic mem
  25. 25. Chemical synapse 1.action potential synaptic terminal Ca+ influx 2.synaptic vesicle 3. neurotransmitter synaptic cleft postsynatic membrane +
  26. 26. The organization of neurons int The simple circuits: nerve nets - cnidarians nerve net - nerve ring radial nerve nerve net
  27. 27. Complex circuits - (ganglion) cephalization- 2 transverse nerve - ventral nerve cord - glangion
  28. 28. - dorsal hollow nerve cord ventral nerve cord segmental ganglia
  29. 29. 1. (Central nervous system; CNS): 2. (Peripheral nervous system; PNS): (cranial nerve) (spinal nerve) (ganglia)
  30. 30. Peripheral Nervous System - cranial nerve 12 spinal nerve 31 -cranial nerve & spinal nerve sensory & motor neuron olfactory & optic nerve sensory nerve -sensory division sensory neuron sensory receptor CNS -motor division motor neuron CNS effector cells-SNS skeletal muscle e -ANS smooth & cardiac muscle
  31. 31. 1. (sensory input) sensory receptor 2. (integration center): CNS 3. (motor output) effector cells PNS
  32. 32. Parasympathetic and sympathetic - parasympathetic sympathetic antagonist) -sym preganglionic ganglion, Achpostganglionic ganglion
  33. 33. Embryonic Development of the
  34. 34. The Limbic System The limbic system generates the feeling; emotion
  35. 35. The limbic system generates the feeling; emotion www.kts.ac.th/e- learning/mahidol/pe/...PE_2550/ ppt www.tta.in.th/uploadfile/1097/SC-13-429- 1438-1097.ppt sumon-kananit.wikispaces.com/file/view/ ppt reg.ksu.ac.th/teacher/myweb/bio2/Nerve% 20cell.ppt www.sc.chula.ac.th/courseware/GenBio105/ Nervous- system_2_12_4.ppt

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